gfs2_quota_sync+0x2e8/0x548 fs/gfs2/quota.c:1329 quotad_check_timeo fs/gfs2/quota.c:1519 [inline] gfs2_quotad+0x304/0x700 fs/gfs2/quota.c:1586 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855 ================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:86 [inline] BUG: KASAN: use-after-free in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] BUG: KASAN: use-after-free in gfs2_inode_refresh+0x994/0xda8 fs/gfs2/glops.c:487 Write of size 8 at addr ffff0000f3223af0 by task gfs2_quotad/5443 CPU: 0 PID: 5443 Comm: gfs2_quotad Not tainted 5.15.188-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x270/0x2b0 mm/kasan/generic.c:189 __kasan_check_write+0x44/0x54 mm/kasan/shadow.c:37 instrument_atomic_write include/linux/instrumented.h:86 [inline] clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] gfs2_inode_refresh+0x994/0xda8 fs/gfs2/glops.c:487 inode_go_lock+0xfc/0x38c fs/gfs2/glops.c:510 do_promote+0x678/0xa70 fs/gfs2/glock.c:507 finish_xmote+0x450/0xb2c fs/gfs2/glock.c:678 do_xmote+0x674/0xf90 fs/gfs2/glock.c:824 run_queue+0x3fc/0x6c0 fs/gfs2/glock.c:872 gfs2_glock_nq+0x828/0x141c fs/gfs2/glock.c:1534 gfs2_glock_nq_init fs/gfs2/glock.h:246 [inline] do_sync+0x3c4/0xa4c fs/gfs2/quota.c:927 gfs2_quota_sync+0x2e8/0x548 fs/gfs2/quota.c:1329 quotad_check_timeo fs/gfs2/quota.c:1519 [inline] gfs2_quotad+0x304/0x700 fs/gfs2/quota.c:1586 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855 Allocated by task 5413: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x74/0x408 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x1e0/0x3e4 mm/slub.c:3233 gfs2_alloc_inode+0x50/0x108 fs/gfs2/super.c:1447 alloc_inode fs/inode.c:261 [inline] iget5_locked+0xa4/0x224 fs/inode.c:1263 gfs2_iget fs/gfs2/inode.c:64 [inline] gfs2_inode_lookup+0xe4/0xb64 fs/gfs2/inode.c:140 gfs2_dir_search+0x148/0x204 fs/gfs2/dir.c:1665 gfs2_lookupi+0x3bc/0x530 fs/gfs2/inode.c:332 gfs2_lookup_simple+0xb0/0x100 fs/gfs2/inode.c:273 init_inodes+0x178/0x2d4 fs/gfs2/ops_fstype.c:906 gfs2_fill_super+0x121c/0x19e0 fs/gfs2/ops_fstype.c:1249 get_tree_bdev+0x358/0x544 fs/super.c:1325 gfs2_get_tree+0x54/0x1b4 fs/gfs2/ops_fstype.c:1332 vfs_get_tree+0x90/0x274 fs/super.c:1530 do_new_mount+0x228/0x810 fs/namespace.c:3014 path_mount+0x5b4/0x1000 fs/namespace.c:3344 do_mount fs/namespace.c:3357 [inline] __do_sys_mount fs/namespace.c:3565 [inline] __se_sys_mount fs/namespace.c:3542 [inline] __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3542 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 14: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0xdc/0x3b4 mm/slub.c:3515 gfs2_free_inode+0x50/0x60 fs/gfs2/super.c:1461 i_callback+0x50/0x78 fs/inode.c:250 rcu_do_batch kernel/rcu/tree.c:2523 [inline] rcu_core+0x7c8/0x1764 kernel/rcu/tree.c:2763 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2776 handle_softirqs+0x344/0xbf0 kernel/softirq.c:576 run_ksoftirqd+0x7c/0x2a0 kernel/softirq.c:943 smpboot_thread_fn+0x4b0/0x920 kernel/smpboot.c:164 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x114 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3011 [inline] call_rcu+0x114/0x8fc kernel/rcu/tree.c:3091 destroy_inode fs/inode.c:316 [inline] evict+0x748/0x810 fs/inode.c:662 iput_final fs/inode.c:1769 [inline] iput+0x6c4/0x77c fs/inode.c:1795 gfs2_put_super+0x26c/0x6bc fs/gfs2/super.c:603 generic_shutdown_super+0x130/0x2f0 fs/super.c:475 kill_block_super+0x70/0xdc fs/super.c:1427 gfs2_kill_sb+0xc0/0xd4 fs/gfs2/ops_fstype.c:-1 deactivate_locked_super+0xb8/0x13c fs/super.c:335 deactivate_super+0xf8/0x118 fs/super.c:366 cleanup_mnt+0x3a4/0x458 fs/namespace.c:1139 __cleanup_mnt+0x20/0x30 fs/namespace.c:1146 task_work_run+0x12c/0x1e0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x24b4/0x3128 arch/arm64/kernel/signal.c:949 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xf0/0x1e0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000f3223640 which belongs to the cache gfs2_inode of size 1608 The buggy address is located 1200 bytes inside of 1608-byte region [ffff0000f3223640, ffff0000f3223c88) The buggy address belongs to the page: page:00000000e3ca7dda refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x133220 head:00000000e3ca7dda order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000dbc59c01 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c6a3f800 raw: 0000000000000000 0000000080120012 00000001ffffffff ffff0000dbc59c01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f3223980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f3223a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f3223a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f3223b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f3223b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000002 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000002] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 5443 Comm: gfs2_quotad Tainted: G B 5.15.188-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : do_sync+0x824/0xa4c fs/gfs2/quota.c:986 lr : do_sync+0x818/0xa4c fs/gfs2/quota.c:986 sp : ffff8000203f7aa0 x29: ffff8000203f7bd0 x28: ffff0000f3223640 x27: 0000000000000001 x26: ffff70000407ef5c x25: 00000000fffffffb x24: ffff0000d2f39800 x23: dfff800000000000 x22: ffff0000e6ff5e00 x21: 000000000000000f x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000000 x17: ffff80000a0dcfa8 x16: ffff8000111bb870 x15: ffff8000088314a0 x14: ffff800008835780 x13: ffff80000802cae0 x12: 0000000000ff0100 x11: 0000000000000000 x10: 0000000000000000 x9 : ffff80001ae281d0 x8 : 0000000000000002 x7 : 0000000000000000 x6 : ffff800008839a20 x5 : ffff0000f268c160 x4 : 0000000000000000 x3 : ffff80000a0db30c x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000010 Call trace: do_sync+0x824/0xa4c fs/gfs2/quota.c:986 gfs2_quota_sync+0x2e8/0x548 fs/gfs2/quota.c:1329 quotad_check_timeo fs/gfs2/quota.c:1519 [inline] gfs2_quotad+0x304/0x700 fs/gfs2/quota.c:1586 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855 Code: 979d8535 f9400294 91004280 d343fc08 (38776908) ---[ end trace dc8ac5d43ffa46b5 ]--- ---------------- Code disassembly (best guess): 0: 979d8535 bl 0xfffffffffe7614d4 4: f9400294 ldr x20, [x20] 8: 91004280 add x0, x20, #0x10 c: d343fc08 lsr x8, x0, #3 * 10: 38776908 ldrb w8, [x8, x23] <-- trapping instruction